Remove Chromium code from Source/WebCore/dom
https://bugs.webkit.org/show_bug.cgi?id=114007

Reviewed by Benjamin Poulain.

Removed.

* dom/Document.cpp:
(WebCore::Document::recalcStyle):
(WebCore::Document::implicitClose):
(WebCore::Document::setFocusedNode):
* dom/MessagePortChannel.h:
(MessagePortChannel):
* dom/ShadowRoot.cpp:
(WebCore::ShadowRoot::ShadowRoot):
* dom/default/chromium: Removed.
* dom/default/chromium/PlatformMessagePortChannelChromium.cpp: Removed.
* dom/default/chromium/PlatformMessagePortChannelChromium.h: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147719 268f45cc-cd09-0410-ab3c-d52691b4dbfc